3D printing pen



FIG. 1 is a front, top perspective view of a 3D printing pen showing my new design;

FIG. 2 is rear, bottom perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is an exploded front perspective view thereof;

FIG. 10 is a front elevational view of the printing part of the 3D printing pen, with the base part omitted for ease of disclosure;

FIG. 11 is a rear elevational view thereof;

FIG. 12 is a left side elevational view thereof; and,

FIG. 13 is a right side elevational view thereof.

The broken lines in the figures illustrate portions of the 3D printing pen that form no part of the claimed design. 

CLAIM The ornamental design for a 3D printing pen, as shown and described. 